2 // compile-flags: --edition=2021 --crate-type=lib
14 pub trait Object<'a> {
16 type Future: Future<Output = Self>;
17 fn create() -> Self::Future;
20 impl<'a> Object<'a> for u8 {
22 type Future = Pin<Box<dyn Future<Output = Self>>>;
23 fn create() -> Self::Future {
28 impl<'a, E, A: Object<'a, Error = E>> Object<'a> for (A,) {
30 type Future = CustomFut<'a, E, A>;
31 fn create() -> Self::Future {
36 pub struct CustomFut<'f, E, A: Object<'f, Error = E>> {
37 ph: PhantomData<(A::Future,)>,
40 impl<'f, E, A: Object<'f, Error = E>> Future for CustomFut<'f, E, A> {
42 fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
52 type Future: Future<Output = ()>;
53 fn call(&self) -> Self::Future;
56 impl<F, Fut> AsyncFn for F
59 Fut: Future<Output = ()>,
62 fn call(&self) -> Self::Future {
69 use self::{async_fn::AsyncFn, object::Object};
71 async fn create<T: Object<'static>>() {
75 async fn call_async_fn(inner: impl AsyncFn) {
79 call_async_fn(create::<(u8,)>).await;